Rumours driven by what. Last time I looked we are in a recession. True it may have just got better but when this plan was hatched we were supposedly in a downward spiral.
The core plan was to adjust the existing resources so that the load was spread more evenly..... i.e. rather than have 5 aircraft doings under 700 hours and the others doing 1300 all the [smaller] fleet could do about the same. [those numbers are plucked from the sky, not 'real' before you start]
There is/was no massive pot that might provide a massive "big" order..... single type..... that would be many times the projected cost of this EC135T2 tweak. They say £3-7M .... but clearly this meeting is all about sounding out industry to see what it can be done for..... Run a rumour like that past any manufacturer and of course they are going to rub their hands and shout 'Me, me, me....'
£1M per airframe seems a massive number but if there is an assumption that the whole fleet will get identical sensor fits that will be a big chunk if they go one way and less if they go another.
It depends whether the intention is to upgrade and modify regardless of the cost or to take the cheapest route [i.e. keeping the Spectrolab searchlight rather than convert the whole fleet to a different searchlight option would be a no brainer].
I suspect that this side of the meeting next week no-one knows the answer or the cost.
If you need a mind picture of where it will go.... I suggest you just look at the seven most recent deliveries.